After creating a group and its respective folders, it is necessary to create them. Do it with this command.
sudo CreateGroupFolder
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Hardcoding a change in Fan speed
This is a pretty good document i found on how to hardcode a change in Fan Speed in OSX. Worked well enough for me. Supposedly tested and working on a MacBook and MacBook Pro. I tried it on a Mac Mini and it seems to work too. Kudos to the author.
Editing Exclusions in Time Machine
Note: Time Machine has default exclusion list that prevents it from backing up some important files in OSX Server. (Ref http://www.bill.eccles.net/bills_words/2008/08/designed-to-fail-apple-time-ma.html).
The file to edit to modify the exclusion list is as follows.
/System/Library/CoreServices/backupd.bundle/Contents/Resources/StdExclusions.plist
Update: Checked up on this in 10.6.3 and it seems that /var/spoool is now backed up.
Online Latex Math Editor
I came across this when needed to update my wiki with Latex math symbols. The link is here. Very useful stuff. http://www.sitmo.com/latex/